Specifications

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Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later Releases
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Chapter 7 Cisco IGX 8400 Series Voice Service
Voice Service—Functional Overview
Voice Connections Supported on the IGX
For further information on the following topics, proceed as follows:
• Connections supported on the IGX, see Table 7-1
• Signaling on the CVM, see the “Signaling on the CVM” section on page 7-4
• Signaling on the URM, see the “Signaling on the URM” section on page 7-4
• Signaling on the UVM, see the “Signaling on the UVM” section on page 7-2
Signaling on the UVM
The UVM provides toll-quality voice and efficiently utilizes wide-area bandwidth for enterprise and
service-provider voice applications. Bandwidth savings achieved through voice compression and silence
suppression can be applied to bursty traffic and a higher number of voice channels per trunk. It supports
channelized T1, E1, or J1 lines for carrying voice, data, or both types of traffic.
You can configure voice-channel signaling of any of the following types on the UVM:
• Robbed-bit signaling (either D4 or ESF frame format)—For T1 lines
• Channel-associated signaling (CAS)—For E1 or J1 lines
• Transparent CCS (ISDN & DPNSS)—For all lines
• E&M-to-DC5A and DC5A-to-E&M conversion—For international applications
The UVM supports both CAS and CSS signaling. However, CSS (such as DPNSS and ISDN signaling)
is supported through a clear (transparent) channel. See Table 7-2 for signaling formats supported on the
UVM.
Table 7-1 Voice Connections Supported on the IGX
Origin Endpoint Destination Endpoint Connection Type
CVM CVM Voice, data, voice+data
HDM (IGX) Data
UVM Voice, data, voice+data
URM UFM VoFR
URM Voice+data (CBR, VBRrt, VBRnt), VoFR,
VoATM, data (ABR, UBR, FST)
UXM Voice+data (CBR, VBRrt, VBRnt),
data (ABR, UBR, FST)
UVM CVM Voice, data, voice+data
Note The CVM cannot terminate connections
using LDCELP or CSACELP compression
HDM (IGX) Data
UVM Voice, data, voice+data